NJU6051 Datasheet, PDF (1/20 Pages) New Japan Radio – White LED Driver with Automatic Dimming Control

NJU6051
PRELIMINARY
White LED Driver with Automatic Dimming Control
! GENERAL DESCRIPTION
The NJU6051 is a white LED driver with an automatic
dimming control. It contains an output driver, a PWM
controller, a luminance sensor control (power supply for
sensor & A/D converter), a step-up DC/DC converter, a serial
interface, etc.
The output driver ensures a 30mA maximum capability
which allows the connection of 8 white LEDs (4 series x 2
parallels). Depending on the ambient light sensed with an
external luminance sensor, the PWM controller controls
PWM duty in 8 steps preselected out of 64 steps. In addition,
the frequency of the DC/DC converter is high so that it
permits the use of small, low-profile inductors and capacitors
to minimize the footprint in space-conscious applications.
All of these benefits make the NJU6051 suitable for the
battery-powered portable applications such as a cellular
phone, a camcorder, PDA, etc.
! PACKAGE OUTLINE
NJU6051KM1
NJU6051V
! FEATURES
# Drives up to 8 white LEDs (4 series x 2 parallels)
V_SW = 18.0V(Max.), I_OUT = 30mA
# Built-in PWM Dimming Control
(Selectable 8 out of 64 steps)
# Built-in Luminance Sensor Control (Power Supply for Sensor & A/D converter)
(No MPU-access required after initial setting)
# Built-in Temperature Compensation Circuit to Suppress the Characteristic Degradation of LEDs
# Uses Small Inductor and Capacitors
# 1.8V to 3.6V Operating Voltage for Logic Circuits (V_DDL)
# 3.0V to 5.5V Operating Voltage for Step-up Circuits (V_DD)
# CMOS Technology
# Package
: QFN20 / SSOP20
Ver.2003-10-23
-1-